Initial commit of Session/Authentication code

Plugin architecture with single Database-backed implementation.

source/lib/SihnonFramework/Auth/IUser.class.php

@@ -0,0 +1,11 @@
+<?php
+
+interface SihnonFramework_Auth_IUser {
+    
+    public function username();
+    
+    public function checkPassword($password);
+    
+}
+
+?>